Ouran High School Host Club only because the ending and the fact that it was over. The other one will have to be Eyeshield 21 that manga got me in the feels and I cried very hard when it ended thought the world was gonna end because of the feels and that is why I still is it T^T I want others to read this manga the art is amazing and the characters I am sure everyone loves Hiruma that dick and the little Sena chan. READ IT. PLEASE.

REC : the day you cry... *hands down*
Naruto (when asuma died)
One piece (some scenes)
Well, I'll post some more if I remember anything but, I really recommended REC for them who love to read shoujo manga